
<template>
  <div>
    <h2>随机点名</h2>
    <div class="box">
      <span>名字是：</span>
      <div class="qs">{{qs}}</div>
    </div>
    <div class="btns">
      <button class="start" @click="btnFnStart">开始</button>
      <button class="end" @click="btnFnEnd">结束</button>
    </div>
  </div>
</template>

<script>
export default {
  data (){
    return{
      qs:'这里显示姓名',
      name:['小红','小丽','小张','小陈','小王',],
      timer:'',
    }
  },
  methods:{
    //开始
    btnFnStart() {
      //建立一个定时器
      this.timer = setInterval(()=>{
        this.fn()},100)
    },
    fn() {
      let num = Math.floor(Math.random() * this.name.length)
      this.qs = this.name[num]
    },
    //结束
    btnFnEnd(){
      clearInterval(this.timer)
    }
  }
};
</script>

<style>
* {
  margin: 0;
  padding: 0;
}

h2 {
  text-align: center;
}

.box {
  width: 600px;
  margin: 50px auto;
  display: flex;
  font-size: 25px;
  line-height: 40px;
}

.qs {
  width: 450px;
  height: 40px;
  color: red;
}

.btns {
  text-align: center;
}

.btns button {
  width: 120px;
  height: 35px;
  margin: 0 50px;
}

</style>